## Reflection: Developing a Conceptual Understanding Subtraction Across Zeros: Using Place Value Understanding to Talk it Through - Section 3: Closure

This lesson was relaxing and low key. It was like discussing an issue with your family because everyone was really interested in thinking differently about subtracting across zeros. They told me they liked the place value chart. It organized their zeros.

I could tell they weren't so nervous about it as we continued to practice on the board.

The Thinkmarks proved to be interesting. Three students came back the next day telling me that they didn't know how to answer my questions. I probably should have had them do the questions at their seats before they took them home. I had supplied each student with a set of the Smart Board notes. So, they had a visual to review the whole lesson.

This student made great effort to write but it is shallow thinking. Thinkmark: no clue.jpg

I need to give them more opportunities to write critically about math.

The next student is as close as I could have wanted to showing me critical thought. She however can pick up on messages in class, but does not really own the thought. She writes well. I like how she talks about the language part of subtracting!  It is good! Thinkmark:On track.jpg

Developing a Conceptual Understanding: Thinkmark

# Subtraction Across Zeros: Using Place Value Understanding to Talk it Through

Unit 1: Place Value and Multi-Digit Addition & Subtraction
Lesson 3 of 7

## Big Idea: Students examine misconceptions and learn to use place value language to regroup and subtract fluently using a place value chart.

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45 minutes

### Mary Ellen Kanthack

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